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Texas Instruments TPS75105DSKR
- Part No.:
- TPS75105DSKR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
TPS75105DSKR.pdf
- Description:
- IC LED DRVR LIN PWM 25MA 10SON
- Quantity:
- Payment:
- Shipping:
Inventory:20,320
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Product details
Overview
TPS75105DSKR from Texas Instruments is a low-dropout linear LED current driver with two independent 2-LED banks in common-cathode topology, delivering up to 25 mA per channel, 2% LED-to-LED current matching, and 28 mV typical dropout voltage at 5 mA - optimized for Li-ion–powered keypad and navigation pad backlighting.
For engineers reviewing the TPS75105DSKR datasheet, TPS75105DSKR pinout, TPS75105DSKR application, or TPS75105DSKR equivalent, this page delivers verified specifications, bank-level PWM dimming control logic, thermal shutdown behavior (165°C), factory-programmable default current (±0.5% accuracy), and WSON-10 package layout constraints critical for mobile handset design.
Technical Context
The TPS75105DSKR implements four matched NMOS-based constant-current sources sharing a single internal 1.225 V reference and 420:1 current mirror ratio. Each bank (A/B) features independent active-high enable pins (ENA/ENB) accepting PWM signals with ≥33 µs minimum on-time for full-current settling.
It operates without internal switching circuitry - eliminating EMI - and maintains tight line regulation (2.0 %/V) and load regulation (0.8 %/V) across 2.7–5.5 V input and 1.5–3.5 V output voltage ranges, supporting mixed-color LED strings with minimal current deviation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max LED current per channel | 25 mA - supports bright white LEDs in portable UI lighting without external current-setting resistors when factory-configured. |
| Current matching (ΔID) | 2% typ (0–4% max) - ensures uniform brightness across all four LEDs under varying forward voltage and temperature conditions. |
| Dropout voltage (VDO) | 28 mV typ at 5 mA - extends usable battery life down to ~2.9 V in single-cell Li-ion systems before current regulation degrades. |
| ISET reference voltage | 1.225 V nominal - enables precise external current programming via RSET = (1.225 V / ILED) × 420, e.g., 32.4 kΩ for 15.9 mA. |
| Enable input threshold | VIH = 1.2 V, VIL = 0.4 V - compatible with standard 1.8 V/3.3 V GPIO without level-shifting for PWM dimming control. |
| Thermal shutdown | 165°C activation / 140°C reset - protects against sustained overloads in compact WSON-10 layouts without external thermal sensors. |
| Operating junction temp | –40°C to +85°C - fully specified for industrial and consumer handheld environments including extended outdoor use. |
Pinout & Package
TPS75105DSKR uses the DSK (WSON-10) package: 2.50 mm × 2.50 mm, 10-pin, exposed thermal pad (Pin 5), RoHS-compliant, moisture-sensitive level 2a.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Supplies all four current sources; accepts 2.7–5.5 V; requires local 1-µF ceramic decoupling near pin. |
| GND | Ground reference | Common return for current sinks and ISET; must be connected to exposed thermal pad for thermal performance. |
| ENA | Bank A enable | Active-high control: PWM input (≥1.2 V high) dims Bank A (D1A/D2A); open or grounded to disable. |
| ENB | Bank B enable | Independent active-high control for Bank B (D1B/D2B); allows asynchronous dimming or blinking per bank. |
| D1A, D2A | Bank A current outputs | Source terminals for two LEDs in common-cathode configuration; each delivers identical regulated current. |
| D1B, D2B | Bank B current outputs | Source terminals for second LED pair; current matching applies across all four channels simultaneously. |
| ISET | Current programming | Connect resistor to GND to set LED current; >3 µA current detected → external mode; <3 µA → factory preset (3–10 mA). |
| NC | No connect | Pin 6 is unconnected internally; must be left floating or tied to GND for mechanical stability - no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed default current | 3–10 mA in 1-mA increments with ±0.5% accuracy - eliminates RSET resistor, reducing BOM count and layout area. |
| Two independent PWM banks | ENA and ENB accept separate 300-Hz–20-kHz PWM signals - enables dual-zone backlighting (e.g., keypad + nav pad) with distinct brightness profiles. |
| No internal switching noise | Linear LDO architecture - zero switching harmonics; meets Class B EMI limits without shielding or ferrite beads. |
| Ultra-low dropout | 28 mV typical at 5 mA - preserves LED drive capability even as Li-ion voltage drops to 3.0 V, extending runtime by ~12% vs. 100-mV-drop competitors. |
| Overcurrent & thermal protection | Internally limits output during short-circuit or overtemperature - prevents damage without external foldback circuitry or fuses. |
Applications
| Keypad Backlighting | Navigation Pad Lighting |
|---|---|
|
Use Scenario: Illuminating alphanumeric keycaps in smartphones and feature phones under low ambient light. IC Role / Device Role / Timing Role: Constant-current source driving two white LEDs per bank, with ENA controlling keypad LEDs and ENB controlling status indicators. Use Value: Factory-set 5 mA per LED ensures consistent luminance across units without calibration; 28 mV dropout sustains brightness until battery reaches 2.95 V. |
Use Scenario: Providing uniform edge-lit illumination for capacitive touch navigation pads in portable media players. IC Role / Device Role / Timing Role: Dual-bank current driver enabling independent dimming of directional arrows (Bank A) and center select (Bank B) via separate PWM inputs. Use Value: 2% LED-to-LED matching eliminates visible brightness gradients across the pad; no EMI interference with adjacent RF sections. |
| Cellular Handset Display Frame | Smartphone Status Indicator Array |
|
Use Scenario: Driving perimeter LEDs around LCD displays for ambient light–adaptive bezel glow in premium handsets. IC Role / Device Role / Timing Role: Four-channel current source powering two red and two green LEDs (mixed-color string), leveraging tight load regulation to maintain current despite VF mismatch. Use Value: 0.8 %/V load regulation allows operation across 1.7 V (red) to 3.3 V (white) LEDs without current drift; 1.5 V min VOUT supports red LEDs reliably. |
Use Scenario: Controlling discrete notification LEDs (charging, message, Bluetooth) with programmable blink patterns and intensity levels. IC Role / Device Role / Timing Role: Independent bank enable logic permits simultaneous or staggered blinking - e.g., ENA pulses for charging status while ENB holds steady for Bluetooth link. Use Value: 33 µs minimum PWM on-time enables crisp 20-kHz dimming without current undershoot; shutdown current <1 µA minimizes standby drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS75103DSKR | Factory-programmed for 3 mA per LED (vs. 5 mA for TPS75105DSKR); identical pinout, package, and PWM interface. | Lower default current suits low-power indicator LEDs where luminance requirements are reduced. | Select when system-level brightness targets align with 3 mA and no external RSET is desired. |
| TPS75100DSKR | Factory-programmed for 10 mA per LED; same thermal and electrical specs; shares WSON-10 footprint. | Higher default current supports brighter UI elements like front-facing status bars or camera focus assist lights. | Choose when higher luminous intensity is required and thermal margin remains sufficient at 10 mA × 4 channels. |
Compared with TPS75103DSKR and TPS75100DSKR, the TPS75105DSKR offers the median factory-set current (5 mA), balancing power efficiency and visibility in mainstream keypad/navigation applications - enabling drop-in replacement within the TPS7510x family without layout or firmware changes.
Availability
TPS75105DSKR is available at Aetrix Electronics and suitable for cellular handsets, smartphone UI lighting, and portable display frame backlighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant WSON packaging.
Supply support for TPS75105DSKR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability power management solutions for industrial, automotive, and consumer markets.
The TPS7510x product line was designed specifically for low-power, EMI-sensitive LED backlighting in space-constrained mobile devices - emphasizing ultra-low dropout, factory-trimmed accuracy, and dual-bank PWM control without external components.
FAQ
What is the factory-programmed LED current for TPS75105DSKR?
The TPS75105DSKR is factory-programmed to deliver 5 mA per LED channel with ±0.5% typical accuracy when the ISET pin is left unconnected. This eliminates the need for an external resistor and reduces bill-of-materials cost while ensuring consistent brightness across production units. The TPS75105DSKR default setting is fixed and cannot be altered post-manufacture without using the ISET pin.
Can TPS75105DSKR drive mixed-color LEDs (e.g., red and white) on the same device?
Yes, the TPS75105DSKR supports mixed-color LEDs due to its tight load regulation (0.8 %/V) and minimum output voltage requirement of only 1.5 V. Red LEDs (~1.7 V VF) and white LEDs (~3.0–3.3 V VF) can be driven simultaneously across its four channels without significant current deviation - confirmed across –40°C to +85°C operating range.
What is the minimum PWM on-time required for full-current operation of TPS75105DSKR?
The TPS75105DSKR requires a minimum PWM on-time of 33 µs to achieve full regulated current on either bank. If both ENA and ENB transition simultaneously, this value applies strictly; however, if one bank is already active, the second bank achieves full current in ~22–23 µs due to faster settling. Shorter pulses result in reduced average LED current and dimming below expected levels.
Does TPS75105DSKR require output capacitors for stability?
No, the TPS75105DSKR does not require output capacitors for stability. Its linear LDO architecture is inherently stable with only standard input decoupling (e.g., 1 µF ceramic near VIN). Adding output capacitance is discouraged - it introduces phase shift that may degrade transient response and is unnecessary for regulation integrity per TI's validated layout guidelines.
How does thermal shutdown behave on TPS75105DSKR?
The TPS75105DSKR activates thermal shutdown at 165°C junction temperature and resets automatically at 140°C. During shutdown, output current ceases and ground current drops to ≤1 µA. This protection is internal and non-latching - normal operation resumes once die temperature falls below the reset threshold, with no external intervention or power-cycle required for TPS75105DSKR recovery.
TPS75105DSKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 25mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-SON (2.5x2.5)
TPS75105DSKR FAQ
1.How can I place an order for TPS75105DSKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS75105DSKR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS75105DSKR reliable?
The price and inventory of TPS75105DSKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS75105DSKR is usually 5 days.
3.What payment methods are accepted for TPS75105DSKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS75105DSKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS75105DSKR?
TPS75105DSKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS75105DSKR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS75105DSKR?
For technical support, including TPS75105DSKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS75105DSKR requirements.
6.How does Aetrix verify that TPS75105DSKR is sourced from the original manufacturer or authorized distributors?
All TPS75105DSKR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS75105DSKR meets industry standards.
7.What is the process for return or replacement of TPS75105DSKR?
All TPS75105DSKR units undergo pre-shipment inspection (PSI). If there is an issue with TPS75105DSKR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS75105DSKR part is unused and in its original packaging.
Return procedure for TPS75105DSKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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